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No. s|4,6|9. Patented Nov. y22, 189s. n. P. oHANLoN.

FILTER.

(Application led Feb. 24, 189B.)

(No Model.)

l the body part being integral to form in theA UNITED STATES ArnNr entre.

DANIEL P. OHANLON, OF TROY, NEV YORK, ASSIGNOR OF TVO-THIRDS TO JOSEPH A. MCCARTHY, OF SAME PLACE.

FILTER.

SPECIFICATION forming part of Letters Patent No. 614,619, dated November 22, 1898.

Application filed February 24, 1898. Serial. No. 65711451. (No model.)

To all whom, t may concern.-

Be it known that I, DANIEL P. OI-IANLON, a citizen of the United States, residing at Troy,

- county of Rensselaer, and State of New York,

have invented certain new and useful Improvements in Filters, of which the following is a specification. v

The invention relates to suoli improvements; and it consists of the novel construction and combination of parts hereinafter described and subsequently claimed.

Reference may be had to the accompanying drawings, and the letters of reference marked thereon, which form a part of this speciiication.

Similar letters refer to similar parts in the several figures therein.

Figure l of the drawings is a top plan view of my improved filter. Fig. 2 is a Vertical section of the same, taken on the broken line 2 2 in Fig. l. Fig. 3 is a similar section of two of the frames, taken on the line 3 3 in Fig. 1, showing the relative positions of two frames andan interposed fibrous sheet before the frames are pressed together.

The body of the filter comprises a plurality of rectangular metallic frames A, superposed one above another, with intervening perforated metallic plates B, inclosing between them a sheet of fibrous material B', impervious to solids, but adapted to permit the iiow of liquids therethrough. The rectangular frames are each provided with an aperture through one side, the apertures A in the alternate frames forming eduction-passages for the filtered liquid and those in the other frames forming induction-passages A2 for the unfiltered liquors. The mouths of the apertures are each tapped or screw-threaded to receive correspondiugly-threaded nipples A3 and A4. The induction-nipples Aare all connected with a common supply-pipe A5, and the eduction-nipples A4 are all connected with a common discharge-pipe A6.

The top and bottom frames differ from the others in that they have no middle aperture,

top frame the tight cover A7 and in the bottom frame the tight bottom A8.

Each side of the several frames is provided with an inwardly-projecting flange A, adapted when the filteris ready for use to support lthe apertured plates, one on the upper and one on the lower side of such flange.

In making up the lter ready for use the frames, iilter-sheets,and apertured plates are deposited one upon another in the order and manner shown in Fig. 3, after which the parts are tightly clamped together by means of the bolt-s O passing down through apertures or 6o grooves in all the frames. The bolts are each screw-threaded on their upper ends and provided with nuts C', which may be provided, when desired, each with an operating-handle C2, by which the frames are clamped together with sufficient force to reduce the thickness of the intervening edges of the iibrous sheets and cause the apertured plates to engage the frame-flanges and tightly support the intermediate filter-sheets, whereby the relative 7o form and position of the various parts are changed from that shown in Fig. 3 to that shown in Fig. 2, and the edges of the fibrous filter-sheets are so tightly compressed as to become impervious to fluids and form a tight packing B4 between the frames to prevent the escape therethrough of any liquids forced in between the apertured plates.

, The operation of the filter is as follows: The liquid to be filtered is forced from the 8o supply-pipe by a pump or other means (not shown) through the alternate frames into the alternate chambers B2, between the neighboring filter plates and sheets, whence it iilters through the flbrous'sheets into the other 85 chambers B3 and passes thence through the eduction-passages into the discharge-pipe. The filter can be easily cleaned by forcing clean water through the filter in the opposite direction, it only being necessary to close the 9o valve V in the discharge-pipe and valve V in the pipe leading from the supply and afterward open the valve V2 in the waste-pipe V3 and valve V4 in the water-supply pipe V5; but the filter-sheets become too much clogged after a considerable use and require to be renewed or taken from the frames and thoroughly cleaned. The necessity of washing or renewing is not apparent until the filtered product coming from the discharge pipe roo shows a color or the presence of impurities. lt may happen that only one of the filter sheets has become clogged or unlit for use, While all the others are in good condition; but the Whole filter must be dismantled and each filter-sheet examined until the defective one is found and the difficulty remedied, as heretofore practiced. Ihave ascertained that by providing each of the eduction-nipples with an inspection-glass D and stop-cock D I am able to locate the imperfect sheet, and by turning the cock D in that nipple to shut olf and cut out of use that sheet7 together with its neighboring sheet, and continue the use of the other sheets, thus saving much time and inconvenience. I am also able to more easily detect the defect for the reason that the imperfect- Work of a single pair of sheets is concentrated in one inspection-glass, Whereas Without the separate glasses the imperfect filtration would be so diluted by the clear product of the other filter-sheets as to be diiiicult of detection in the main dischargepipe or at its outlet, and I am thus able by providing each pair of filter-sheets with a separate eduction-tube and inspection-glass to quickly detect and eliminate the imperfection of a single pair of sheets, and thereby secure a much more uniform and a better product.

IVhat I claim as new, and desire to secure by Letters Patent, is-

l. In a filter, a plurality of Supporting frames and filter-sheets disposed alternately one above another, the alternate frames beingprovided with induction-passages,and the other frames with eduction-passages, and

means for clamping the frames and sheets together, in combination with a supply-pipe, connections between the supply-pipe and the induction-passages; a discharge pipe and separate connections between the dischargepipe and the eduction-passages 5 and separate inspection-glasses in the eduction connections,respectively,substantially as described;

2. In a filter, the combination with a plu#` rality of filter-sheets and a discharge-pipe common to all the sheets; of a plurality of eduction-tubes each connected with and leading from a different sheet to the dischargepipe; and an inspectionglass and valve iu each eduction-tube, substantially as described.

3. In a filter, the combination With a plurality of supporting-frames having fluid passage-Ways, and an inner supporting-flange on each frame, of a plurality of iilter-sheets, a pair of apertured plates, each member of a pair covering the middle portion of one of the opposite sides of each sheet and resting upon one side of a frame-liange with the projecting edges of each sheet compressed between a neighboring pair of frames; means for clamp ing the frames together; and means for forcing fluids through the frames, substantially as described.

In testimony whereof I have hereunto set' NVitnesses:

GEO. A. MosHER, FRANK C. CUR'ris. 

